package penghuali;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

public class PoiWriteExcel<T>
{
    /**
     * @param title
     *            表格标题名
     * 
     * @param headers
     *            表格属性列名数组
     * 
     * @param dataset
     *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
     *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
     * 
     * @param out
     *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
     */
    @SuppressWarnings("unchecked")
    public void exportExcel(String title, String headers[], Collection<T> dataset, OutputStream out)
    {
        // 申明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        
        // 生成一个表格
        HSSFSheet sheet = workbook.createSheet(title);
        
        // 设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth(15);
        
        // 生成一个样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置这些样式
        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        
        // 生成一个字体
        HSSFFont font = workbook.createFont();
        font.setColor(HSSFColor.VIOLET.index);
        font.setFontHeightInPoints((short)12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        
        // 把字体应用到当前的样式
        style.setFont(font);
        
        // 生成并设置另一个样式
        HSSFCellStyle style2 = workbook.createCellStyle();
        style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
        style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        // 生成另一个字体
        HSSFFont font2 = workbook.createFont();
        font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        // 把字体应用到当前的样式
        style2.setFont(font2);
        
        // 产生表格标题行
        HSSFRow row = sheet.createRow(0);
        for (int i = 0; i < headers.length; i++)
        {
            HSSFCell cell = row.createCell(i);
            cell.setCellStyle(style);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }
        
        // 遍历集合数据，产生数据行
        Iterator<T> it = dataset.iterator();
        
        int index = 0;
        
        while (it.hasNext())
        {
            index++;
            row = sheet.createRow(index);
            T t = (T)it.next();
            
            // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
            // 返回 Field 对象的一个数组，这些对象反映此 Class 对象所表示的类或接口所声明的所有字段
            Field[] fields = t.getClass().getDeclaredFields();
            
            for (int i = 0; i < fields.length; i++)
            {
                HSSFCell cell = row.createCell(i);
                cell.setCellStyle(style2);
                Field field = fields[i];
                String fieldName = field.getName();
                String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
                
                try
                {
                    Class cls = t.getClass();
                    
                    Method getMethod = cls.getMethod(getMethodName, new Class[] {});
                    
                    Object value = getMethod.invoke(t, new Object[] {});
                    
                    // 数据类型都当作字符串简单处理
                    String textValue = value.toString();
                    
                    if (null != textValue)
                    {
                        HSSFRichTextString richString = new HSSFRichTextString(textValue);
                        
                        HSSFFont font3 = workbook.createFont();
                        font3.setColor(HSSFColor.BLUE.index);
                        richString.applyFont(font3);
                        cell.setCellValue(richString);
                        
                    }
                }
                catch (SecurityException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (NoSuchMethodException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (IllegalArgumentException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (IllegalAccessException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                catch (InvocationTargetException e)
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
            }
        }
        
        try
        {
            workbook.write(out);
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    
    public void buchong()
    {
        
        // 申明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        
        // 生成一个表格
        HSSFSheet sheet = workbook.createSheet();
        
        // 声明一个画图的顶级管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        // 定义注释的大小和位置,详见文档
        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short)4, 2, (short)6, 5));
        // 设置注释内容
        comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
        // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
        comment.setAuthor("leno");
        
    }
    
    public static void main(String[] args)
    {
        PoiWriteExcel<Student> pwe = new PoiWriteExcel<Student>();
        
        String[] headers = {"姓名", "邮箱", "部门"};
        
        List<Student> list = new ArrayList<Student>();
        
        list.add(new Student("彭华丽1", "penghl@163.com", "研发部"));
        list.add(new Student("彭强强1", "penghl@163.com", "销售部"));
        list.add(new Student("彭华华1", "penghl@163.com", "企划部"));
        
        System.out.println("eeeee");
        
        try
        {
            OutputStream out = new FileOutputStream("E://a.xls");
            
            pwe.exportExcel("学生表", headers, list, out);
        }
        catch (FileNotFoundException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
}
